JP7207580B1 - Water electrolysis cell, method for manufacturing water electrolysis cell - Google Patents

Abstract

A water electrolysis cell capable of suppressing deterioration in performance even when a microporous layer is provided is provided. A water electrolysis cell having a solid polymer electrolyte membrane, a catalyst layer, a microporous layer, and a gas diffusion layer, wherein the microporous layer comprises Ti, Mn, Co, Mo, Ru, W, Nb, and A support made of an oxide containing at least one element selected from Ta and a conductive material supported on the support are included. [Selection drawing] Fig. 1

Description

The present disclosure relates to water electrolysis cells used for water electrolysis.

Patent Literature 1 discloses that two types of GDLs (gas diffusion layers) having different porosity and surface smoothness are stacked and used. Specifically, the adjustment is performed by changing the diameter of the Ti fiber to change the porosity and smoothness.

JP-A-2001-342587

Ti fiber sintered bodies are sometimes used for the gas diffusion layer used in water electrolysis cells, but Ti fiber sintered bodies tend to have large unevenness, and the fibers of the sintered body are used to form catalyst layers and even solids. The polymer electrolyte membrane may be locally crushed, and the solid polymer electrolyte membrane may become thinner along the fibers, resulting in reduced durability. Since the Ti fiber has a diameter of about 20 μm, the effect is great especially when a thin solid polymer electrolyte membrane (20 μm or less) is used.
A technique to form a microporous layer (MPL, microporous layer) between the gas diffusion layer and the catalyst layer by coating in order to suppress the deformation of the catalyst layer and solid polymer electrolyte membrane due to the fibers of the gas diffusion layer. There is However, the stable substances that make up the MPL in a water electrolysis environment have low electrical conductivity, which results in an increase in the electrical resistance of the water electrolysis cell and a decrease in performance.

Therefore, in view of the above problems, an object of the present disclosure is to provide a water electrolysis cell capable of suppressing deterioration in performance even if a microporous layer is provided.

The present application relates to a water electrolysis cell having a solid polymer electrolyte membrane, a catalyst layer, a microporous layer, and a gas diffusion layer, wherein the microporous layer is composed of Ti, Mn, Co, Mo, Ru, W, Nb, and Ta. Disclosed is a water electrolysis cell comprising a support made of an oxide containing at least one element selected from and a conductive material supported on the support.

The gas diffusion layer may be a Ti fiber sintered body.

The microporous layer may contain ionomer in a proportion of 50 mass % or less.

The thickness of the microporous layer may be 20 μm or more and 100 μm or less.

The conductive material may be 50 mass % or more with respect to the microporous layer.

The carrier may be particulate and have an average particle size of 100 μm or less.

The carrier may be in the form of a nanosheet.

The method of manufacturing the above water electrolysis cell can include the steps of preparing a composition for the microporous layer and making it into an ink, and coating the catalyst layer with the composition made into an ink. .

The method for producing the water electrolysis cell described above comprises the steps of preparing a composition for the microporous layer and making it into an ink, applying the composition made into an ink onto a transfer sheet, drying it, and transferring the dried composition to the catalyst layer.

The method for producing the above water electrolysis cell includes the steps of preparing a composition for the microporous layer and making it into an ink, applying the composition made into an ink onto a transfer sheet, drying it, and on the transfer sheet transferring the dried composition to the gas diffusion layer.

According to the present disclosure, deterioration in performance can be suppressed even when a microporous layer is provided.

FIG. 1 is a conceptual diagram illustrating the configuration of a water electrolysis cell 10. As shown in FIG. FIG. 2 is a diagram for explaining the manufacturing method S10 of the water electrolysis cell 10. As shown in FIG. FIG. 3 is a diagram for explaining the manufacturing method S20 of the water electrolysis cell 10. As shown in FIG. FIG. 4 is a diagram explaining the manufacturing method S30 of the water electrolysis cell 10. As shown in FIG.

1. Water Electrolysis Cell FIG. 1 conceptually shows the form of a water electrolysis cell 10 . The water electrolysis cell 10 is a unit element for decomposing pure water into hydrogen and oxygen, and a plurality of such water decomposition cells 10 are stacked to form a water electrolysis stack.
The water electrolysis cell 10 is composed of a plurality of layers, one of which serves as an oxygen generating electrode (anode) and the other serves as a hydrogen generating electrode (cathode) with a solid polymer electrolyte membrane 11 interposed therebetween. The anode comprises an anode catalyst layer 12, an anode microporous layer 13, an anode gas diffusion layer 14, and an anode separator 15 which are laminated in this order from the solid polymer electrolyte membrane 11 side. On the other hand, the cathode comprises a cathode catalyst layer 16, a cathode microporous layer 17, a cathode gas diffusion layer 18, and a cathode separator 19 in this order from the solid polymer electrolyte membrane 11 side.

1.1. Solid Polymer Electrolyte Membrane The material (electrolyte) that constitutes the solid polymer electrolyte membrane 11 is a solid polymer material, such as a proton-conducting ion-exchange membrane made of a fluorine-based resin, a hydrocarbon-based resin material, or the like. be done. It exhibits good proton conductivity (electrical conductivity) in wet conditions. A more specific example is a membrane made of Nafion (registered trademark), which is a perfluoro-based electrolyte.
Although the thickness of the solid polymer electrolyte membrane is not particularly limited, it is 100 μm or less, preferably 50 μm or less, more preferably 10 μm or less. In this embodiment, the effect is particularly remarkable with respect to a thin solid polymer electrolyte membrane.

1.2. Anode Catalyst Layer The oxygen electrode catalyst layer 12 is a layer made of an electrode catalyst containing at least one noble metal catalyst such as Pt, Ru, Ir, etc. and an oxide thereof, as is well known. More specifically, Pt, iridium oxide, ruthenium oxide, iridium ruthenium oxide, or a mixture thereof can be used.
Iridium oxides include iridium oxide (IrO ₂ , IrO ₃ ), iridium tin oxide, iridium zirconium oxide, and the like.
Ruthenium oxides include ruthenium oxide (RuO ₂ , Ru ₂ O ₃ ), ruthenium tantalum oxide, ruthenium zirconium oxide, ruthenium titanium oxide, ruthenium titanium cerium oxide and the like.
Iridium ruthenium oxides include iridium ruthenium cobalt oxide, iridium ruthenium tin oxide, iridium ruthenium iron oxide, iridium ruthenium nickel oxide, and the like.

1.3. Anode Microporous Layer The anode microporous layer 13 of the present disclosure is made by adjusting the components as necessary to retain more water in the solid polymer electrolyte membrane, or to remove the oxygen generated by electrolyzing water. and protects the solid polymer electrolyte membrane 11 and the anode catalyst layer 12 from deformation caused by the shape of the anode gas diffusion layer 14 while maintaining electrical conductivity.
The anode microporous layer 13 of the present embodiment includes a material in which a conductive material having electrical conductivity is supported on an oxide carrier.

[Carrier]
It is desirable that the oxide forming the support be an inert oxide with low solubility in water and in an acidic environment. Specific examples include oxides containing at least one element selected from Ti, Mn, Co, Mo, Ru, W, Nb, and Ta. More specifically, K ₂ Ti ₄ O ₉ and K ₂ La ₂ Ti ₃ O ₁₀ as Ti-based oxides, and KNb ₃ O ₈ , K ₄ Nb ₆ O ₁₇ and KLaNb ₂ as Nb-based oxides. O ₇ and KSr ₂ Nb ₃ O ₁₀ , KSr ₂ Ta ₃ O ₁₀ as a Ta-based oxide, KTiNbO ₅ as a TiNb-based oxide, K ₂ W ₂ O ₇ as a W-based oxide, and other oxides as KMO ₂ (where M is at least one of Mn, Co, Mo and Ru).

Alternatively, an oxide having photoreduction ability may be used as the oxide. According to this, the conductive material can be supported on the oxide by photoreduction. Specifically, K ₂ Ti ₄ O ₉ , KTiNbO ₅ , K ₄ Nb ₆ O ₁₇ , KLaNb ₂ O ₇ and KSr ₂ Ta ₄ O ₁₀ among the oxides exemplified above correspond to this.
According to photoreducible oxides, electrons and holes are generated when light is irradiated to a solution in which oxides and catalyst precursors are dispersed. The reduction causes the conductive material to be carried on the oxide. Carrying by such a method can increase the carrying amount of the conductive material.

In order to suppress the flow resistance of water and generated oxygen from increasing, the above-mentioned oxide forming the support is preferably in the form of particles, but it is preferably in the form of a nanosheet (a two-dimensional structure with a thickness of 1 nm to 100 nm). may

When the support is particles, the average particle size (D50) is preferably 100 μm or less, more preferably 10 μm or less. As a result, it is possible to suppress an increase in gas-liquid flow resistance. The "average particle diameter (D50)" is the value of the volume-based median diameter (D50) measured by laser diffraction/scattering particle size distribution measurement unless otherwise specified. The median diameter (D50) is the diameter (volume average diameter) at which the cumulative volume of particles becomes half (50%) of the total when the particles are arranged in order from the smallest particle diameter.

On the other hand, in the case of a nanosheet, the longest portion of the layer surface is twice or more, for example, ten times or more, or fifty times or more the thickness of the layer. Here, the fact that the carrier is in the form of a nanosheet may be confirmed by X-ray diffraction (XRD) measurement or the like to confirm that it has a layered crystal structure.

[Conductive material]
The conductive material contained in the anode microporous layer 13 and supported by the above-mentioned oxide carrier can be particles having conductivity, and platinum (Pt), iridium (Ir) and its oxide, ruthenium ( Ru) and oxides thereof.
Iridium oxides include iridium oxide (IrO ₂ , IrO ₃ ), iridium tin oxide, iridium zirconium oxide, and the like.
Ruthenium oxides include ruthenium oxide (RuO ₂ , Ru ₂ O ₃ ), ruthenium tantalum oxide, ruthenium zirconium oxide, ruthenium titanium oxide, ruthenium titanium cerium oxide and the like.
Iridium ruthenium oxides include iridium ruthenium cobalt oxide, iridium ruthenium tin oxide, iridium ruthenium iron oxide, iridium ruthenium nickel oxide, and the like.

The content of the conductive material is preferably 50 mass % or more with respect to the anode microporous layer 13 . Thereby, a decrease in conductivity can be reliably suppressed.

[others]
The thickness of the anode microporous layer 13 is preferably as thin as possible within a range thicker than the fiber diameter of the fibrous Ti contained in the anode gas diffusion layer 14 described below. As a result, deformation and breakage of the solid polymer electrolyte membrane 11 and the anode catalyst layer 12 due to fibrous Ti can be suppressed. More specifically, the thickness of the anode microporous layer 13 is preferably 20 μm or more and 100 μm or less.

Here, the anode microporous layer 13 may contain an ionomer in a proportion of 50% by mass or less. By containing the ionomer, coating properties can be improved, and water supplied during water decomposition can smoothly permeate due to its hydrophilicity.
Examples of ionomers included herein include ionomers made of perfluoro-based electrolytes, which are electrolytes used in solid polymer electrolyte membranes.

1.4. Anode Gas Diffusion Layer The anode gas diffusion layer 14 is composed of a member having gas permeability and electrical conductivity, and is not particularly limited, and known materials may be used. Specifically, metal fibers, metal particles, or the like may be used. A porous conductive member consisting of can be mentioned.
Among them, it is possible to apply a mode in which fibrous Ti is layered like a non-woven fabric, as in the present mode. Specifically, a titanium fiber sintered body can be used as the anode gas diffusion layer. This makes it difficult to corrode in a severe corrosive environment during water electrolysis and has excellent durability.
The form of the titanium fiber sintered body is not particularly limited, and a known one can be used. The porosity is preferably 30% or more, and the fiber diameter is 10 μm or more and preferably 100 μm or less. Also, the titanium fiber may be coated with Pt.

1.5. Anode Separator The anode separator 15 is a member provided with a channel 15a through which pure water is supplied to the anode gas diffusion layer 14 and oxygen generated is discharged. Any known anode separator can be used without any particular limitation as long as it is such an anode separator.

1.6. Cathode Catalyst Layer The catalyst contained in the cathode catalyst layer 16 can be a known catalyst such as platinum, platinum-coated titanium, platinum-supported carbon, palladium-supported carbon, cobalt glyoxime, and nickel glyoxime. .

1.7. Cathode Microporous Layer The cathode microporous layer 17 was also generated by adjusting the components as necessary to retain more water in the solid polymer electrolyte membrane, or by electrolyzing excess water and water. It is a layer having a function of efficiently discharging hydrogen.
A known material can be used for the cathode microporous layer 17 of this embodiment, and the main components thereof can be a water-repellent resin such as polytetrafluoroethylene (PTFE) and a conductive material such as carbon black. However, this does not preclude the use of the material used for the anode microporous layer 13 for the cathode microporous layer 17 .

1.8. Cathode Gas Diffusion Layer The cathode gas diffusion layer 18 is composed of a member having gas permeability and electrical conductivity. In this embodiment, a known cathode gas diffusion layer can be used, and specific examples include porous members such as carbon cloth and carbon paper. It should be noted that carbon can be used in this manner because oxidation does not readily occur at the cathode, but this does not prevent the same configuration as the anode gas diffusion layer 14 described above.

1.9. Cathode Separator The cathode separator 19 is a member provided with a flow path 19a through which the separated hydrogen and accompanying water flow, and known ones can be used.

1.10. Generation of Hydrogen by Water Electrolysis Cell Hydrogen is generated from pure water by the water electrolysis cell 10 described above as follows. Therefore, the water electrolysis cell and water electrolysis stack of the present disclosure can be provided with known members and configurations necessary for producing hydrogen in addition to the above.
Pure water (H ₂ O) supplied to the anode (oxygen generating electrode) from the flow path 15a of the anode separator 15 generates oxygen, It is decomposed into electrons and protons (H ⁺ ). At this time, protons move to the cathode catalyst layer 16 through the solid polymer electrolyte membrane 11 . On the other hand, electrons separated by the anode catalyst layer 12 reach the cathode catalyst layer 16 through an external circuit. Then, the protons receive electrons in the cathode catalyst layer 16 to generate hydrogen (H ₂ ). The generated hydrogen reaches the cathode separator 19 and is discharged from the channel 19a. Oxygen separated by the anode catalyst layer 12 reaches the anode separator 15 and is discharged from the channel 15a.

Water is supplied from the anode separator 15 to the anode catalyst layer 12, and water and generated oxygen are discharged from the anode catalyst layer 12 to the anode separator 15. Suitably done by layer 13 and anode gas diffusion layer 14 .
On the other hand, the hydrogen generated in the cathode catalyst layer 16 and the water that has permeated the solid polymer electrolyte membrane 11 accompanied by protons permeate the cathode microporous layer 17 and the cathode gas diffusion layer 18 functioning as flow paths, reach the cathode separator 19 at .

2. Manufacturing method 2.1. Form 1
The water electrolysis cell 10 as described above can be manufactured, for example, as follows. FIG. 2 shows the flow of the manufacturing method S10 of the water electrolysis cell 10 according to one embodiment. Each step is as follows.
In the manufacturing method S10, a membrane electrode assembly for water electrolysis in which the anode catalyst layer 12 is laminated on one surface of the solid polymer electrolyte layer 11 and the cathode catalyst layer 16 is laminated on the other surface by a known method is prepared in advance.

In step S11, a conductive material is supported on an oxide as a carrier. The supporting method may be a well-known method and can be carried out in a solution. Moreover, when the oxide acts as a photocatalyst, it can be supported by photoreduction.
The conductive material-supporting oxide formed in the solution is filtered and dried to obtain particles for the anode microporous layer.

In step S12, the electrolyte ionomer and the particles obtained in step S11 are mixed with primary alcohol, secondary or higher alcohol, water, and dispersed to obtain an anode microporous layer ink. Examples of primary alcohols include ethanol, 1-propanol and 1-butanol, and examples of secondary and higher alcohols include 2-propanol and t-butyl alcohol. Although the electrolyte is not particularly limited, it has proton conductivity, and the same electrolyte as that of the solid polymer electrolyte membrane 11 can be mentioned.

In step S13, the anode microporous layer ink obtained in step S12 is applied to the anode catalyst layer 12 laminated on the solid polymer electrolyte layer 11 by a coating method such as spraying, and dried to form the anode microporous layer 13. do.

In step S 14 , a commercially available cathode microporous layer ink is applied to the cathode catalyst layer 16 laminated on the solid polymer electrolyte membrane 11 by a coating method such as spraying, and dried to form the cathode microporous layer 17 .

In step S15, the anode gas diffusion layer 14 and the cathode gas diffusion layer 18 are laminated on the anode microporous layer 13 and the cathode microporous layer 17 of the laminate obtained up to step S14 and pressed.

In step S16, the anode gas diffusion layer 14 of the laminate obtained up to step S15 is laminated with the anode separator 15, and the cathode gas diffusion layer 18 is laminated with the cathode separator 19, followed by pressing.

2.2. Form 2
FIG. 3 shows the flow of the manufacturing method S20 of the water electrolysis cell 10 according to another embodiment. Each step is as follows.
In the manufacturing method S20, a membrane electrode assembly for water electrolysis in which the anode catalyst layer 12 is laminated on one side of the solid polymer electrolyte layer 11 and the cathode catalyst layer 16 is laminated on the other side is prepared in advance by a known method.

In step S21, a conductive material is supported on an oxide that is a carrier. The supporting method may be a well-known method and can be carried out in a solution. Moreover, when the oxide acts as a photocatalyst, it can be supported by photoreduction.
The conductive material-supporting oxide formed in the solution is filtered and dried to obtain particles for the anode microporous layer.

In step S22, the electrolyte ionomer and the particles obtained in step S21 are mixed with primary alcohol, secondary or higher alcohol, water, and dispersed to obtain an anode microporous layer ink. Examples of primary alcohols include ethanol, 1-propanol and 1-butanol, and examples of secondary and higher alcohols include 2-propanol and t-butyl alcohol. Although the electrolyte is not particularly limited, it has proton conductivity, and the same electrolyte as that of the solid polymer electrolyte membrane 11 can be mentioned.

In step S23, the anode microporous layer ink obtained in step S22 is applied to a PTFE sheet by a coating method such as spraying, and dried to form an anode microporous layer transfer sheet.

In step S24, the anode microporous layer transfer sheet obtained in step S23 is placed on the anode catalyst layer 12 laminated on the solid polymer electrolyte layer 11 to transfer the anode microporous layer 13 thereon.

In step S25, a commercially available cathode microporous layer ink is applied to the PTFE sheet by a coating method such as spraying and dried to obtain a cathode microporous layer transfer sheet.

In step S26, the cathode microporous layer transfer sheet obtained in step S25 is placed on the cathode catalyst layer 16 laminated on the solid polymer electrolyte layer 11 to transfer the cathode microporous layer 17 thereon.

In step S27, the anode gas diffusion layer 14 and the cathode gas diffusion layer 18 are laminated on the anode microporous layer 13 and the cathode microporous layer 17 of the laminate obtained up to step S26 and pressed.

In step S28, the anode gas diffusion layer 14 of the laminate obtained up to step S27 is laminated with the anode separator 15, and the cathode gas diffusion layer 18 is laminated with the cathode separator 19, followed by pressing.

2.3. Form 3
FIG. 4 shows the flow of the manufacturing method S30 of the water electrolysis cell 10 according to another embodiment. Each step is as follows.
In the manufacturing method S30, a membrane electrode assembly for water electrolysis in which the anode catalyst layer 12 is laminated on one side of the solid polymer electrolyte layer 11 and the cathode catalyst layer 16 is laminated on the other side is prepared in advance by a known method.

In step S31, a conductive material is supported on an oxide that is a carrier. The supporting method may be a well-known method and can be carried out in a solution. Moreover, when the oxide acts as a photocatalyst, it can be supported by photoreduction.
The conductive material-supporting oxide formed in the solution is filtered and dried to obtain particles for the anode microporous layer.

In step S32, the electrolyte ionomer and the particles obtained in step S31 are mixed with primary alcohol, secondary or higher alcohol, water, and dispersed to obtain an anode microporous layer ink. Examples of primary alcohols include ethanol, 1-propanol and 1-butanol, and examples of secondary and higher alcohols include 2-propanol and t-butyl alcohol. Although the electrolyte is not particularly limited, it has proton conductivity, and the same electrolyte as that of the solid polymer electrolyte membrane 11 can be mentioned.

In step S33, the anode microporous layer ink obtained in step S32 is applied to a PTFE sheet by a coating method such as spraying, and dried to form an anode microporous layer transfer sheet.

In step S34, the transfer sheet for the anode microporous layer obtained in step S33 is placed on the sheet to be the anode gas diffusion layer 14, and the layer to be the anode microporous layer is transferred to the sheet to be the anode gas diffusion layer 14.

In step S35, a commercially available cathode microporous layer ink is applied to the PTFE sheet by a coating method such as spraying, and dried to obtain a cathode microporous layer transfer sheet.

In step S<b>36 , the cathode microporous layer transfer sheet obtained in step S<b>35 is overlaid on the sheet to be the cathode gas diffusion layer 18 to transfer the layer to be the cathode microporous layer to the sheet to be the cathode gas diffusion layer 18 .

In step S37, the anode gas diffusion layer 14 with the anode microporous layer obtained in step S34 is laminated on the anode catalyst layer 13 of the membrane electrode assembly for water electrolysis, and the cathode catalyst layer 16 of the membrane electrode assembly for water electrolysis is laminated. The cathode gas diffusion layer 18 with the cathode microporous layer obtained in step S36 is stacked and pressed.

In step S38, the anode gas diffusion layer 14 of the laminate obtained up to step S37 is laminated with the anode separator 15, and the cathode gas diffusion layer 18 is laminated with the cathode separator 19, followed by pressing.

3. Effect, etc. If a material with large unevenness or exposed ends of fibers is used in the gas diffusion layer of the water electrolysis electrode, for example, when a Ti fiber sintered body is used, the catalyst layer, and even the The solid polymer electrolyte membrane was crushed, and the solid polymer electrolyte membrane was locally thinned along the fiber, which sometimes caused a problem. In particular, since the Ti fiber has a wire diameter of about 20 μm, the effect is great when a thin solid polymer electrolyte membrane (for example, 20 μm or less) is used.
Therefore, there is a technique to apply a microporous layer from the viewpoint of suppressing the deformation of the membrane by the fibers, but this has low conductivity in the water electrolysis environment, resulting in an increase in the electrical resistance of the water electrolysis cell and a decrease in performance. I had a problem.

On the other hand, according to the present disclosure, by forming a microporous layer containing a conductive material, the conductivity of the microporous layer can be increased, the electrical resistance of the water electrolysis cell can be suppressed, and the deterioration of performance can be suppressed. It becomes possible.

10 water-splitting cell 11 solid polymer electrolyte membrane 12 anode catalyst layer (oxygen generating electrode side catalyst layer)
REFERENCE SIGNS LIST 13 anode microporous layer 14 anode gas diffusion layer 15 anode separator 16 cathode catalyst layer (hydrogen generating electrode side catalyst layer)
17 Cathode Microporous Layer 18 Cathode Gas Diffusion Layer 19 Cathode Separator

Claims (8)

A water electrolysis cell having a solid polymer electrolyte membrane, a catalyst layer, a microporous layer, and a gas diffusion layer,
The gas diffusion layer is a Ti fiber sintered body,
The microporous layer comprises an oxide support containing at least one element selected from Ti, Mn, Co, Mo, Ru, W, Nb, and Ta;
and a conductive material carried on the carrier ,
The microporous layer contains an ionomer in a proportion of 50% by mass or less,
water electrolysis cell. A water electrolysis cell having a solid polymer electrolyte membrane, a catalyst layer, a microporous layer, and a gas diffusion layer,
The gas diffusion layer is a Ti fiber sintered body,
The microporous layer comprises an oxide support containing at least one element selected from Ti, Mn, Co, Mo, Ru, W, Nb, and Ta;
and a conductive material carried on the carrier,
The carrier is particulate and has an average particle diameter of 100 μm or less,
water electrolysis cell. A water electrolysis cell having a solid polymer electrolyte membrane, a catalyst layer, a microporous layer, and a gas diffusion layer,
The gas diffusion layer is a Ti fiber sintered body,
The microporous layer comprises an oxide support containing at least one element selected from Ti, Mn, Co, Mo, Ru, W, Nb, and Ta;
and a conductive material carried on the carrier,
The carrier is in the form of a nanosheet,
water electrolysis cell. The water electrolysis cell according to any one of claims 1 to 3, wherein the microporous layer has a thickness of 20 µm or more and 100 µm or less. The water electrolysis cell according to any one of claims 1 to 4, wherein the conductive material accounts for 50 mass% or more of the microporous layer. A method for producing a water electrolysis cell according to any one of claims 1 to 5 ,
formulating a composition for the microporous layer into an ink; and
a step of applying the ink composition to the catalyst layer;
A method for manufacturing a water electrolysis cell. A method for producing a water electrolysis cell according to any one of claims 1 to 5 ,
formulating a composition for the microporous layer into an ink;
a step of applying and drying the ink composition onto a transfer sheet; and
transferring the composition dried on the transfer sheet to the catalyst layer;
A method for manufacturing a water electrolysis cell. A method for producing a water electrolysis cell according to any one of claims 1 to 5 ,
formulating a composition for the microporous layer into an ink;
a step of applying and drying the ink composition onto a transfer sheet; and
transferring the composition dried on the transfer sheet to the gas diffusion layer;
A method for manufacturing a water electrolysis cell.

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